[vsnet-grb-info 3976] Swift-BAT Trigger 237821 is a Cosmic Ray Shower event

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5793
SUBJECT: Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
DATE:    06/11/09 03:08:45 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
 
S.D. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/UMBC),
A.D Falcone (PSU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
 
The BAT trigger 237821 (Falcone et al, GCN Circ 5790) is not a GRB.
It is due to a cosmic ray shower in the spacecraft.  All 100 events
recorded in the BAT detector array occurred within a pair of 100-microsecond
timestamp intervals.  There is a remote chance that this is actually
due to instrumental noise.  Either way, it is not a GRB, nor is it
anything astrophysical.